gizmologist shares an efficient and sturdy 2-wire+ splice that is a modification of the Western Union / Lineman splice used by NASA, tuned for using less wire and ease of execution. From Instructables:
Do you want to make a strong, reliable, secure, neat connection in a 2-wire (or more) cable? This is not that hard. Despite the title, you don't have to be a Rocket Scientist to make a neat wire splice and do it right....
The kind of splice we're going to use is a modified Western Union or Lineman splice. I find the modified version easier to make. NASA's preferred method is the standard lineman splice, which, unlike ordinary twisted splices, has a very high tensile strength.
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